An addictive mystery whodunit-meets-psychological thriller centered on a pair of identical twin sisters, Ava and Zelda. When Ava returns home to the family vineyard in the wake of Zelda's sudden death, she must find out who murdered her beloved twin while reckoning with dangerous revelations about the woman Zelda had become in her absence. To complicate matters: Zelda knew she was in serious danger, so she left behind letters for Ava. Zelda's cryptic and gut-wrenching "dead letters" send Ava on a twisted scavenger hunt for the truth — forcing Ava to question everyone she's ever loved.